Crossword Genius

Unbalanced state affected my mastery (9)

Ross

I believe the answer is:

asymmetry

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'unbalanced state' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'affected my mastery' is the wordplay.
'affected' is an anagram indicator.
'my'+'mastery'='mymastery'
'mymastery' is an anagram of 'ASYMMETRY'.

Can you help me to learn more?

(Other definitions for asymmetry that I've seen before include "with different faces" , "displays a lack of regularity" , "Irregularity" , "Lack of similarity between two parts or halves" .)

I've seen this clue in The Times.
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